Libraries preparing to go live on FOLIO typical conduct a GAPs analysis reviewing FOLIO's current state of feature development. In some cases they identify missing functionality, which for that given institution is a road blocker for them to go live. At this session you will learn about how a development project with an Index Data development team typical is organized, and how we work with the library - from the very early start to Bugfest test, and even beyond go live. Communication and collaboration about the new requirements with the community and other development teams is happening in parallel, all of this to make sure the new work aligns with the FOLIO communities expectations, and that new development can be adopted, not just by the funding institution, but other interested parties as well.